<template>
    <div class="star"  :class="classType">
    	<span v-for="itemClass in itemClasses" :class="itemClass" class="star-item"></span>
    </div>
</template>

<script type="text/ecmascript-6">
	const LENGTH = 5;
	const CLS_ON = 'on';
	const CLS_OFF = 'off';
	const CLS_HALF = 'half';
    export default {
    	props: {
    		size: {
    			type: Number
    		},
    		score: {
    			type: Number
    		}
    	},
    	computed: {
    		classType() {
    			return 'star-' + this.size;
    		},
    		itemClasses() {
    			let result = [];
    			let score = Math.floor(this.score * 2) / 2;
    			let hasDecimal = score % 1 !== 0;
    			let integer = Math.floor(score);
    			for (let i = 0; i < integer; i++) {
    				result.push(CLS_ON);
    			}
    			if (hasDecimal) {
    				result.push(CLS_HALF);
    			}
    			while (result.length < LENGTH) {
    				result.push(CLS_OFF);
    			}
    			return result;
    		}
    	}
    };
</script>

<style lang="stylus" rel="stylesheet/stylus">
@import '../../commen/stylus/mixin.styl'
.star
	.star-item
		display: inline-block
		background-repeat: no-repreat
	&.star-48
		.star-item
			width: 20px
			height: 20px
			margin-right: 22px
			background-size: 20px 20px
			&.last-child
				margin-right: 0
			&.on
				bg-image('star48_on')
			&.half
				bg-image('star48_half')
			&.off
				bg-image('star48_off')
	&.star-36
		.star-item
			width: 15px
			height: 15px
			margin-right: 6px
			background-size: 15px 15px
			&.last-child
				margin-right: 0
			&.on
				bg-image('star36_on')
			&.half
				bg-image('star36_half')
			&.off
				bg-image('star36_off')
	&.star-24
		.star-item
			width: 10px
			height: 10px
			margin-right: 3px
			background-size: 10px 10px
			&.last-child
				margin-right: 0
			&.on
				bg-image('star24_on')
			&.half
				bg-image('star24_half')
			&.off
				bg-image('star24_off')
</style>
